package com.atguigu.educenter.controller;

import com.atguigu.commentutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.config.exceptionhandler.GuliException;
import com.google.gson.Gson;
import com.mysql.cj.jdbc.SuspendableXAConnection;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

@CrossOrigin
@Api(description = "微信扫描")
@RequestMapping("/api/ucenter/wx")
@Controller //只是请求地址，不需要返回数据
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //1.生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode(){
        //微信开放平台授权baseUrl, %s相当与？代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL; //获取业务服务器重定向地址
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8"); //url编码
        } catch (UnsupportedEncodingException e) {
            throw new GuliException(20001, e.getMessage());
        }

        //设置%s里面的值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );
        //重定向到请求微信地址里面
        return "redirect:"+url;
    }

    //2.获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code,String state){
        try {
            //1.获取code值，临时票据，类似于验证码
            //2.拿着code请求，微信固定的地址，得到两个值 access_token和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数：id密钥和code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址,得到返回两个值 access_token 和openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");

            //把扫描人信息添加数据库里面
            //判断数据库里面是否存在数据
            UcenterMember member = memberService.getOneIdMember(openid);
            if (member == null){

                //3.拿着得到access_token和openid，再去请求微信提供的地址，获取扫描人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname=(String)userInfoMap.get("nickname");
                String headimgurl = (String) userInfoMap.get("headimgurl");

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(),member.getNickname());

            //最后：返回首页面("redirect:http://localhost:3000?token="+jwtToken)
            return "redirect:https://www.baidu.com/";
        }catch (Exception e){
            throw new GuliException(20001,"登录失败");
        }
    }
}
